22 days of continuous relief. live claritin clear. every day. take the claritin clear challenge: get continuous non-drowsy allergy relief or your money back. go to claritinchallenge.com for details. ñp úz u ♪ little darling ♪ >>> "all that mattered" 43 years ago today, the first earth day. more than 20 million americans took part. some of them got on bikes and roller skates. others put on gas masks to raise awareness of the threat from air pollution. many americans that day represent the start of the environmental movement. april 22nd is stil earth day. happy earth day, anthony and gayle. >> i was in eighth grade. >> i'm certainly old enough to remember, but it surprises me that it's been around 43 years. >> yeah, it surprises me too. >> time flies, gayle. >>> some of the world's best trained animals keep us safe every day. "60 minutes" gives us an up-close look at the dogs who work side by side with navy s.e.a.l.s. that's next on "cbs this morning." s.e.a.l.s. that's next on "cbs this morning." >>> this portion of "cbs this morning" spons